Schematic Hi-Fi Power Amplifier 60-100W
The output devices are MJL4281A (NPN) and MJL4302A (PNP), and feature high bandwidth, Driver transistors are MJE15034 (NPN) and MJE15035 (PNP).
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Skema Rangkaian, Headphone Dengan Infra Red
IR transmitter uses two-stage transistor amplifier to drive two series-connected IR LEDs. An audio output transformer is used (in reverse) to couple audio output from TV to the IR transmitter. Transistors T1 and T2 amplify the audio signals received from TV through the audio transformer. Low-impedance output windings (lower gauge or thicker wires) are used for connection to TV side while high-impedance windings are connected to IR transmitter. Read entire Article »
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High Temperature Alarm Circuits
This series of high temperature, serves to warn us about the increase in temperature, a temperature sensor which is used thermistor (TH1), the normal temperature of approximately 25 ° C the resistance of the thermistor approximately 10 K and at increased temperature reaches 94 ° C thermistor will resistant to change until they reach of about 1 K, the existence of this value changes that would enable Darlington Q1 and Q2 to drive the relay which is connected to the alarm. Power supply 9 VDC using the voltage, this circuit can be used to control the fire. Read entire Article »
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Simple Electronic Dice
The IC1 is a 555 timer IC is connected for, Astable operation the clock pulses are fed to the IC2 via the 10K resistor. The IC2 is a 10 stage counter, output 6 (pin 5) is connected to RESET (pin 15), thus giving us a 6 stage counter , outputs 0 to 5. Read entire Article »
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Tube Amplifier
The circuit is simple, yet is capable of excellent performance. I designed it specifically for use as an amplifier for the digital sound card in my computer. Audio input can be from any two-channel line level device such as a television, CD player, or VCR. It is of the tube type, using only 5 tubes total with no more than about 45 Read entire Article »
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Crystal
I have received a number of emails regarding schematics for crystal radios. After about the third email, I figured that I may as well put one on my page. So here it is. The circuit is very simple with only 5 parts, but performs very nicely when used with the right size antenna. Read entire Article »
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5 watt FM Trasmitter
Here is the schematic, PC board pattern, and parts placement for a low powered FM transmitter. The range of the transmitter when running at 9V is about 300 feet. Running it from 12V increases the range to about 400 feet. This transmitter should not be used as a room or telephone bug Read entire Article »
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Stethoscope Circuit
Stethoscopes are not only useful for doctors, but home mechanics, exterminators, spying and any number of other uses. Read entire Article »
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Circuit Mixer
This simple circuit mixes two or more channels into one channel (eg. stereo into mono). The circuit can mix as many or as few channels as you like and consumes very little power. Read entire Article »
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Scematic Effect
Fuzz is one of the classic guitar effects, and this simple circuit generates it quite well. The circuit is so compact that it can be built into guitars or amps that do not have built in fuzz to add that capability to the instrument. Read entire Article »
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Tube Radio Circuit
A regenerative radio works by feeding back a small amount of amplified output of the detector back into the input. Thus it achieves sensitivity far beyond what only a detector could alone. Read entire Article »
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AM Radio Circuit
The ZN414 IC contains an entire automatic gain controlled AM receiver in a small three pin package. With only a few external components, a simple radio with excellent selection and reception can be constructed. Read entire Article »
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